Heat Transfer

Question 1

conduction

Answer 1

Particles in the medium pass heat along to their neighbour (particle collision, no net movement of particles)

Question 2

convection

Answer 2

The medium itself moves (bulk movement of particles)

Question 3

forced convection

Answer 3

Forced convection describes the motion of a fluid that is caused by forces outside of it.These forces often move the fluid faster than or in a different direction to natural convection.

Question 4

conductors

Answer 4

Any material through which thermal energy flows quickly.

Question 5

radiation

Answer 5

Heat is passed along without requiring a medium

Question 6

insulators

Answer 6

Any material through which thermal energy flows slowly.

Question 7

objects radiate and absorb electromagnetic radiation at the same time

Answer 7

objects w higher temps than their surroundings radiate more energy than they absorb so they cool down
objects w lower temps than their surroundings absorb more energy than they radiate so they warm up

Question 8

the surface of the body affects how efficiently it radiates and absorbs radiation

Answer 8

rough surfaces radiate and absorb more than smooth surfaces
relfective/white surfaces dont absorb/radiate much but rough surfaces do

Question 9

conductors examples

Answer 9

metals like copper and iron

Question 10

insulator examples

Answer 10

non metallic materials like air plastic wood rubber